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Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943)
[ACTIVE]

Resistance of Glass to Thermal Shock

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The resistance of glass to thermal shock may be increased considerably by tempering which is the controlled introduction of strain. Tempering and annealing represent opposite extremes in heat treatment. Annealing removes strain by slow cooling while tempering introduces strain by rapid cooling. Class fractures originate in regions of tension. When hot glass is subjected to a cold medium, a thermal gradient is introduced and the resulting strain distribution places the surface in a state of tension. If the tension exceeds the tensile strength of the glass a fracture will occur. Condenser lenses of projection machines are often subjected to thermal shock of this type. Tempering the glass places the surfaces under compression. A much greater thermal shock may then be applied without causing fracture, because sufficient stress must be introduced to completely neutralize the compression before the surface can go into tension and fail.
Publication Date
1943-10-01
DOI
10.5594/J09814
Link
https://doi.org/10.5594/J09814
Author(s)
Charles D. Oughton
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Charles D. Oughton; Resistance of Glass to Thermal Shock, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943. Available at https://doi.org/10.5594/J09814
Snippet:
Charles D. Oughton; Resistance of Glass to Thermal Shock, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943. Available at https://doi.org/10.5594/J09814

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Charles D. Oughton; Resistance of Glass to Thermal Shock, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943. Available at https://doi.org/10.5594/J09814
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<span class="citation">Charles D. Oughton; <cite>Resistance of Glass to Thermal Shock</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943. Available at <a href="https://doi.org/10.5594/J09814" target="_blank" rel="noopener">https://doi.org/10.5594/J09814</a></span>

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Preview:
Charles D. Oughton; Resistance of Glass to Thermal Shock, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943
doi: 10.5594/J09814
url: https://doi.org/10.5594/J09814
Snippet:
<li>
Charles D. Oughton; <cite id="bib-10-5594-j09814">Resistance of Glass to Thermal Shock</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 41, Issue: 10, October 1943); SMPTE, 1943
<span class="doi">10.5594/J09814</span>
</li>